> You don’t know the job as well as they do – in fact, you are hiring them precisely because you don’t know how to do the job. So how do you hold them accountable for doing a good job?

Kind of like using a high-level language and/or a framework: Are you using it because you don't know how to do what the software does, or are you using it to automate a task you could do 'by hand' if you had an infinite number of hours in a day? Only in the second case are you qualified to tell if the tool you just brought in is doing a good job.